Final answer:
The Abbasid Empire moved the capital to Baghdad for two main reasons: it was more centrally located and accessible, and it allowed for closer ties with the East.
Step-by-step explanation:
The Abbasid Empire moved the capital to Baghdad for two main reasons. Firstly, Baghdad was seen as more centrally located and accessible, allowing for better control and administration of the empire. Secondly, the shift in power and influence towards the East, particularly the Persian Empire, made it advantageous for the Abbasids to have their capital in a city closer to the East. This allowed for closer ties with the East, including trade and cultural exchanges, which contributed to the growth and prosperity of Baghdad.